Lamp



Oct. 21,` 1930. F. BAMFORD 1,779,156

LAMP' Filed Jan. 23, 1928 2 Sheets-Sheet l nveuto/L anotan 5 oct. 21,r 1930. F, BAMFORD 1,779,156

LAMP Filed Jan. 23. 1928 2 Sheets-Sheet 2 v www, 5

Patented Oct. 21, 1930 g'UNITED STATES PATENT OFFICE FRANK I.. BAMFORII'OF DETROIT, MIoHIeAM'AssIGNOIa To o. M. HALI. LAMPOOM- PANY, or DETROIT, MICHIGAN, A CORPORATION or MICHIGAN Y LAMP Application 1ed'J'anuary23, 1928. Serial No. 248,768.

This inventionl relates to adjusting mechanisms and has particular referenceto an adjusting mechanism for the lamp. A A

An obj ect of this invention is to provide an 1 adjusting mechanism having means for compensating for variations in the alignment of different portions thereof.

A still further obj ect of this invention is to provide an adjusting mechanism, having the means aforesaid, which mechanism will be simple in construction and yet thoroughly efficient in operation. c A Other objects and advantages of this invention will become apparent `as the following description proceeds, particularly. when reference is had to the accompanying: drawings wherein, V f

Figure l is a vertical sectional view through r a lamp, having adjusting mechanism constructed in accordance with this invention applied thereto; v

Figure 2 is a fragmentary horizontall seotional view through the structure shown ind Figure l;

Figure 3 is a detailed perspectivenview of the elements of the adjusting mechanism A showing the same in the order of and prior to their assembly, and n Figure tis a side elevational view of the adjusting mechanism showing portions of the same disaligned. A

In the construction oflamps,`particularly of the headlight type, it isi customary to mount a reflector substantially rigidly in a casing, to adjustably mount a lamp vbulb on the reflector and -t-o mount a member-on the casing for adjusting the said lamp bulb.

` More particularly there is usually Aformed an lamp bulb of Aa,

manufacture of .the lamp, these openings will be aligned when the reflector is mounted within the casing. In actual commercial production, however, it has been found, that while it is a comparatively simple matter to form the openings centrally of the reflector and casing, it is next to impossible to so perA- fectly form allthe reflectors and all of the casings that when any reflector is assembled with any casing, the openingsin the two will be aligned; y Obviously, if when the-reflector is mounted within the casing, the openings in the reflector andpcasing are not aligned, diflivculty is experienced in installing the adjusting mechanism since, Vas lbrought out before, one portion ofthis adjusting mechanism is mounted in the opening in the casing and the other portion of thesame iscarried .by or mounted in the opening in the reflector.

To overcome this difficulty and lto facilitate the commercialA production of the reflectors A and lamp casings, without particular regard to the alignment of the openings in Ithese` y members when the same are assembled, this invention contemplates the. provision of means whereby compensation may be readily made for any variation in the alignment of the openin'gfin the reflector with the opening in the casing# A A Further in 'some forms of lamps, it is desirable, for the purpose of obtaining acertain reflection of the light rays from the lamp bulb, to mount the lamp bulb toone side of the A center of the reflector. f Obviously such a mounting of the lamp bulb positions ,the r same to one side ofthe openinginthe lamp casing, so that the same difficulty arises inthe installation of adjusting mechanism in a lamp* of 'this character l'as arises when the lamp A bulb is out of alignment with the 'opening in the lamp casing by virtue of slight inaccura-V ciesV of manufacture.; This .invention will f therefore also find of this character. v v A Y Referring now particularlyto the drawings wherein like reference characters designate corresponding parts throughout all views of the same, thereis disclosed a lamp,

including the casing l0fand the reflector ll. The reflector 11 is mounted substantially particular utilityinlampsk rigidly Within the casing' 10 as by engagement of the flange 12 with securino members, suoli as threaded members 18, carried by the rim 14 ot' the lamp casino:

In lamps of this character, it is cust to form an opening 15 substantialiv ce of the vreiiector 11 and an opening "in tially centrally ot the asmg 10. 'if f ing 15 is adapted to receive lamp the opening 1G is adapted to rcceiv justing member, accessible from tlf of the lamp casing and connected to the bulb, whereby actuation of the adjus members adjusts the lamp buib. bro

lamps, difficulty is experienced in o i an accurate alignment of the openm 153 wi the opening 16 and it therefore besoin necessary to provide some means wher 3i the adpisting member mounted in the open. ing 16 may adJust the lamp bulb mounted. in the opening 15 regardless of this disahgnment.

Referring now particularly to i and 2 of the drawing it xviii be noted that a bushingl? is mounted in the ope e of the reflector 11. This bushing is a to slidably receive a` iamp socket 18 provided with lateral proiections 19 adapted to enn gage in slots 2O in the bushing 17.

The lamp socket 18 is af; ed to receive a lamp bulb 21, which lamp b is n'iovabie with the socket 18 and is adapted to be ad justed by the mechanism her after to be described.

Extending rearwardly 17 and carried by the same is a aine provided in its base with a slot to receiae The threaded niema threaded member 2li. Le ber A24 is provided with a is engaged by the portions ci" t ie if. bounding the slot 25, whereby the t member 2erY is mounted 'for ro fixed against longitudinal in v Rigidly secured to the soci-:et 1 26 bentas at 2? to torni a port, for threaded engagement with ed member 24. Obviously rotet threaded member nieves gitudinally to slide be lamp lamp bulb 21 lougitudniaiiy oV 111g 17 The" member 21` might be teru'ied driven member of the adjusting mechanism and for driving this .ien nieiiibe i provided adrivingl member mc rotation in theopening formed casingi 10. The driving niembeJV vided with ahead 29 adapted for env by a suit-able adjusting tool ca bored on its inner end to `term the slotted as at 31. Adapted for mou A, in the socket 30 is a pin provided. vritlithe ears' 38 for engagement in the slots ObT viously rotation of the driving member 28 by the engagement of a suitable tool Wit-h the head 29 rotates the pin 32.

For eiiecting a driving connection between the pin 82, and the threaded member l.iid :tor compensating for variations in the alignment oi' the pin with the member 24v, there is provided a piate 35 having the diametrically arr iiged slots 36, 3G, 36 and 35. is clearly illustrated these slots are arranged in pairs, 'the siots oi eac-h pair being diametricaliy opposite each other.

Carried by the threaded member 24 is a head 8'3" provided with the arms 88 bent their ends for engagement in the diametrically opposite slots 36 and 36. The arms 38 may be provided with heads 39 whereby they may be secured agiinst disconnection from these slots.

The pin is provided with a head 1i() similar to the head and with the arms 4l bent at their ends 'for engagement in the other pair oit' diametricaliy opposed slots 36 and 36. The arms il are also provided with heads i2 whereby they may be maintained in engagement With their Vrespe'ltivc slots.v

The arms 38 and i1 slidably engage their respective slots in the piate 3T to compensate for any variations in the alignment oi' the pin 32 with the threaded Y" member 2e. .ir desired a spring .-3 may be sleeved on the driving` member 28 ttor engagement with the casing` 10 and thel head si() to urge the head Li() and pin 32 toward the late 35.

As clearl'jyv illustrates.. i Figure 4i oit the drawings, the heads i0 3'? will readily adjust themselves with respect to the plate 35 to form a driving connection between the driving member 28 and threaded member regardless of the position of the openingI with respect tothe opening 1G. Upon the rotation of the driving member 2S, 'the arms 38 and 1 will slide in their respective siete to transmit this rotative movement tothe member and'to compensate 'tor any variation inthe alignment oi the me ber 24;; with the member 28. The conne-"tion beother in tivo directions and permits a ment of these members autoinaticaliy upon the installation oit th adjusting mechanism in rtrie lamp.

ii/hilo I haveshown and described the in* vention as applied to lamps of the headli-n type, it is obvious that the same may be i y plied. to a ianip of any character, wherein it is desired 'to adjust the lamp buib.'kv it will be seen that the inveztion viii eliminate the necessity of so 'forming the reflector andthe casing as te cause the openings in the reflector and casing to be in accurate alignment and will thus permit 'the' manufacture oit lamps in commerciai quantities without regard to "absolute accuracy.

The present description and the drawings are submitted as one embodiment which the inventive idea may assume and are not to be construed as delinitive of the limits to which rthe bushing, a threaded member rotatably carried by the said frame, an arm carried by said lamp bulb and threadedly engaging the said threaded member, a headed element rotatably mounted in the aperture in the casing, the said headed element being coun- Y terbored to form a socket, a pin slidably but non-rotatably mounted in the said socket. and means for connecting the free end of said pin with the free end of said threaded element and for compensating for variations in the alignment of the pin with the threaded element.

2.1In av headlight, in combination, a casing, a reflector within the said casing, the said reflector and casing each being provided With an aperture, a bushing in the aperture in the reflector, a lamp bulb axially movable in the said bushing, a frame carried by the bushing, a threaded member rotatably carried by the said frame, an arm carried by lamp bulb, and threadedly engaging the said threaded member, a headed element rotatably mounted in the aperturey in the casing, the said headed element being counterbored to form a socket', a pinslidably but non-rotatably mounted in the said Y socket and means for connecting the free end of saidpin with thefree end of said threaded element and for compensating for variations in the alignment of the pin with the threaded element, said means including a plate,a head on said pin slidably connected to said plate, anda head on said threaded element slidably connected to said `plate for movement in a plane at right angles to the plane of movement of the head on the said pin. Y Y v 3. In a lamp, a casing, a reflector in said casing, a lamp bulb carried by said reflector, a rotatable driven member carried by said reflector for adjusting said rlamp bulb, a driving member carriedby said casing and separated from said driven member, and a drivingconnection between said driving and driven members permitting disalignment of said members. f .n

VLL'In a 1amp,a casing, a reflector in said casing, a lamp bulb carried by said reflec tor, a driven member carried by said bulb and rotatable relative to said reflector, bulb and casing for adjusting said bulb relative to said reflector, a driving member carried by and rotatable relative to said casing, said driving member being spaced from said driven member, and a driving connection be- Y tween said driving and drivenl members causing said members to rotate in unison llut permitting disalignmentl of said memers. Y

'5. In a lamp bulb adjusting. mechanism, a socket, an arm lixed to said socket, a rotatable Amember threadedlyv engaging said arm, a driving member for rotating said rotatable member, said driven and driving members being arranged substantially end to end with a space therebetween, and means connecting the driving member to the rotatable member for rotating the latter from the former and for compensating for variations in the alignment vof the driving member with the rotatable member, said means including -a coupling having parts connected to said drivenand driving members and connected to each other. n

6,. In a lamp bulb adjusting mechanism, i

the combination with a lamp socket, of a threaded member connected to said socket for adjustingtliesame, a head on :said threaded member, a coupling member slidably connected to said head, apin slidably connected to said coupling member, and a headed element conn'ectedto said pin for rotating the same, said coupling member saidthreaded member to compensate for variations in the alignment of the aXis of said p in with the aXis of said threaded member.

7. In combination, a lamp casing, "areflector Within the casing, a bushing rigid V permitting movement of said pin relative to j with the reflector, a socket slidable in the l bushing, a lamp bulb mounted in the socket,

a member rigid with thesocket, andmeans for adjusting said socket and bulb relative to the bushing and reflector, including twov rotary elements connected together so that they rotate in unison but are capable of two movements relative to each other, one of said elements constituting a driving means, and being accessible at the casing, and the other of said elements constituting a driven means andl threadedly engaging the member'rigid with the socket.

.In testimony lwhereof I affix my signature.

FRANK L; BAMFORD. f 

